This cake is like an earthenware pitcher (ghara) used to store and cool water. The pores of the lining allow water evaporation and thereby cooling of the water inside. It is still used to cool drinking water in parts of the world where electricity/refrigeration is not readily available. I made this cake for my beautiful mother's 90th birthday. She did not grow up with refrigeration, air conditioning and many facilities that we take for granted. She never complained and turned out a strong and resourceful person. God Bless!.
It is a plain yellow cake with Bavarian cream filling. Mom was amused at the cake design, and did not want to cut it.
It is also used as a musical instrument, when empty, of-course. The hollow sound can bring forth lovely music when played creatively.